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` A. L. BARBER.

CONSTRUCTION 0F CONCRETE PAVEMENTS.

No. 338,382. Y Patented Marr. 23, 1886.

N. PETERS.V Phoxo-ulhognphw. wasmngmn. D. C.

UNITED STATES PATENT OEEICE'.

AMZI L. BARBER, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNORTO .THEBARBER ASPHALT PAVING COMPANY, 4OE SAME PLACE.

CONSTRUCTION OF CONCRETE PAVEMENTS.

SPECIFICATION forming part of Letters Patent No. 338,382, dated March23, 1886.

Application filed October 26, 1885. Serial No. 180,915. (No model.)

.To all whom t may concern.-

Be it known that I, AMZI L. BARBER, a citi zen of the UnitedStates,residing at- Washing ton,in the District of Columbia, haveinvented 5 certain new and useful Improvements in the Construction ofConcrete Pavements,of which the following is a specification, referencebeinghad therein to the accompanying drawing.

My invention relates to improvements in the construction of concretepavements.

The object of myinvention is to combine the curbstones of the street andthe rails of streetrailroads with the hydraulic-concrete base andasphalt-concretewearing-surfaceofaTrinidadasphalt pavement in such amanner as to make a substantial and permanent structure, thus obviatingin a great measure the necessity of frequent repairs to the curbs andrails or track of street-railroad rails.

In the drawing I have shown a sectional view of a pavement embodying myinvention. Referring to the drawing, A indicates the hydraulic-concretebase, and B the top course or Wearing-surface composed of Trinidadasphalt concrete, both of whichA are laid in the usual manner as laid inVashington, District of Columbia, and other cities.

C indicates the curbstones, the lower edges of which are embeddedseveral inches in the 3o hydraulic-concrete base A, as shown, While saidconcrete is in a soft or plastic condition, so that when the concretesets or becomes hard the curbstones will be iirmly embedded there in. Bysetting the curbstones in this manner I am enabled to use to advantagestones from eight to nine inches in depth, instead of stones fromeighteen to twenty-four inches in depth, vas is nor the case, thuseffecting a great saving in material in the matter of curbstones.

4o A further advantage of this construction is that the curbst-ones canbe set at a uniform depth, and the danger of being displaced by theupheavals of frost is obviated,owing to the solid and Water-proof baseor foundation in which they are embedded.

D indicates the rails of a street-railroad, which may be of the formshown, or of any other suitable or convenient form which will present afoot or base adapted to be embedded cement or concrete top B is laiddown and coal-tar, pulverized rock-quartz, gravel, and

in the hydrauliclconcrete base A, a railhav- 5o ing a broad base beingpreferred.

In laying the rails inthe hydraulicconcret-e base the flange and web ofthe rail are embedded in said concrete while it is yet in a plastic orsemi-plastic condition, so that when the concrete sets or becomes hardthe rails will be iirmlyheld in position without the use of crossties orsleepers. The hydraulic concrete which comes in contact with the railsmay be made of a ner quality than that of the main body of the base, butit should be laid at the same time, in order to insure a perfect bond orunion between the two. The rails should be embedded in the hydraulicconcrete at a uniform depth, in order that the tops of the rails may bein the same plane and present a level surface. After the rails andcurbstones have been placed in position, and the hydraulic concrete hasset or become hard, the asphalt o rolled in the usual manner, care beingtaken 7 to roll or compact the same around the web of the rail so as toform a Water-tight joint, and also to bring the top of thewearing-surface of the pavement flush with the tops of the rails; and insome instances it may be desirable to extend the hydraulic concrete upto the top of the rails, with a strip of the same extending a few inchesout from each side of the rail, which, when the asphaltic concrete isjoined thereto, will form a waterproof joint.

In the construction of this kind of a pavement, I prefer to make thegutters of the upper surface of hydraulic concrete, such as is describedand claimed in an application filed by me October 7, 1885, SerialNo.179,178.

I am aware that it is not new to secure railroad-rails in position byembedding the same in a composition of asphaltum or residuum of 9o sand;and such I do not claim.

Having thus described my invention, what I claim,and desire to secure byLetters Patent, 1s-

l. A pavement or roadway composed of a Trinidad asphalt concrete wearingsurface, having the curbstones and rails which form the street-railrailroad partially embedded in In testimony whereof I afX-my signaturein presence of two Witnesses.

AMZI L. BARBER.

Witnesses:

R. M. RICHARD, ROBERT E. MoRRls.

